static int inc_block_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, u64 blocknr) { struct btrfs_path path; int ret; struct btrfs_key key; struct btrfs_leaf *l; struct btrfs_extent_item *item; struct btrfs_key ins; u32 refs; find_free_extent(trans, root->fs_info->extent_root, 0, 0, (u64)-1, &ins); btrfs_init_path(&path); key.objectid = blocknr; key.flags = 0; btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); key.offset = 1; ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, &path, 0, 1); if (ret != 0) BUG(); BUG_ON(ret != 0); l = &path.nodes[0]->leaf; item = btrfs_item_ptr(l, path.slots[0], struct btrfs_extent_item); refs = btrfs_extent_refs(item); btrfs_set_extent_refs(item, refs + 1); BUG_ON(list_empty(&path.nodes[0]->dirty)); btrfs_release_path(root->fs_info->extent_root, &path); finish_current_insert(trans, root->fs_info->extent_root); run_pending(trans, root->fs_info->extent_root); return 0; }
static int finish_current_insert(struct btrfs_trans_handle *trans, struct btrfs_root *extent_root) { struct btrfs_key ins; struct btrfs_extent_item extent_item; unsigned int i; int ret; u64 super_blocks_used; struct btrfs_fs_info *info = extent_root->fs_info; btrfs_set_extent_refs(&extent_item, 1); btrfs_set_extent_owner(&extent_item, extent_root->root_key.objectid); ins.offset = 1; ins.flags = 0; btrfs_set_key_type(&ins, BTRFS_EXTENT_ITEM_KEY); for (i = 0; i < extent_root->fs_info->current_insert.flags; i++) { ins.objectid = extent_root->fs_info->current_insert.objectid + i; super_blocks_used = btrfs_super_blocks_used(info->disk_super); btrfs_set_super_blocks_used(info->disk_super, super_blocks_used + 1); ret = btrfs_insert_item(trans, extent_root, &ins, &extent_item, sizeof(extent_item)); if (ret) { btrfs_print_tree(extent_root, extent_root->node); } BUG_ON(ret); } extent_root->fs_info->current_insert.offset = 0; return 0; }
/* * remove an extent from the root, returns 0 on success */ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, u64 blocknr, u64 num_blocks, int pin) { struct btrfs_path path; struct btrfs_key key; struct btrfs_fs_info *info = root->fs_info; struct btrfs_root *extent_root = info->extent_root; int ret; struct btrfs_extent_item *ei; struct btrfs_key ins; u32 refs; BUG_ON(pin && num_blocks != 1); key.objectid = blocknr; key.flags = 0; btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); key.offset = num_blocks; find_free_extent(trans, root, 0, 0, (u64)-1, &ins); btrfs_init_path(&path); ret = btrfs_search_slot(trans, extent_root, &key, &path, -1, 1); if (ret) { btrfs_print_tree(extent_root, extent_root->node); printf("failed to find %llu\n", (u64)key.objectid); BUG(); } ei = btrfs_item_ptr(&path.nodes[0]->leaf, path.slots[0], struct btrfs_extent_item); BUG_ON(ei->refs == 0); refs = btrfs_extent_refs(ei) - 1; btrfs_set_extent_refs(ei, refs); if (refs == 0) { u64 super_blocks_used; if (pin) { int err; unsigned long bl = blocknr; radix_tree_preload(GFP_KERNEL); err = radix_tree_insert(&info->pinned_radix, blocknr, (void *)bl); BUG_ON(err); radix_tree_preload_end(); } super_blocks_used = btrfs_super_blocks_used(info->disk_super); btrfs_set_super_blocks_used(info->disk_super, super_blocks_used - num_blocks); ret = btrfs_del_item(trans, extent_root, &path); if (!pin && extent_root->fs_info->last_insert.objectid > blocknr) extent_root->fs_info->last_insert.objectid = blocknr; if (ret) BUG(); ret = update_block_group(trans, root, blocknr, num_blocks, 0); BUG_ON(ret); } btrfs_release_path(extent_root, &path); finish_current_insert(trans, extent_root); return ret; }
static int remove_extent_ref(struct btrfs_root *root, u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid) { struct btrfs_trans_handle trans; struct btrfs_extent_item *item; struct btrfs_path *path; struct btrfs_key key; u64 refs; int ret; btrfs_init_dummy_trans(&trans); key.objectid = bytenr; key.type = BTRFS_EXTENT_ITEM_KEY; key.offset = num_bytes; path = btrfs_alloc_path(); if (!path) { test_msg("Couldn't allocate path\n"); return -ENOMEM; } path->leave_spinning = 1; ret = btrfs_search_slot(&trans, root, &key, path, 0, 1); if (ret) { test_msg("Couldn't find extent ref\n"); btrfs_free_path(path); return ret; } item = btrfs_item_ptr(path->nodes[0], path->slots[0], struct btrfs_extent_item); refs = btrfs_extent_refs(path->nodes[0], item); btrfs_set_extent_refs(path->nodes[0], item, refs - 1); btrfs_release_path(path); key.objectid = bytenr; if (parent) { key.type = BTRFS_SHARED_BLOCK_REF_KEY; key.offset = parent; } else { key.type = BTRFS_TREE_BLOCK_REF_KEY; key.offset = root_objectid; } ret = btrfs_search_slot(&trans, root, &key, path, -1, 1); if (ret) { test_msg("Couldn't find backref %d\n", ret); btrfs_free_path(path); return ret; } btrfs_del_item(&trans, root, path); btrfs_free_path(path); return ret; }
static int insert_normal_tree_ref(struct btrfs_root *root, u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid) { struct btrfs_trans_handle trans; struct btrfs_extent_item *item; struct btrfs_extent_inline_ref *iref; struct btrfs_tree_block_info *block_info; struct btrfs_path *path; struct extent_buffer *leaf; struct btrfs_key ins; u32 size = sizeof(*item) + sizeof(*iref) + sizeof(*block_info); int ret; btrfs_init_dummy_trans(&trans); ins.objectid = bytenr; ins.type = BTRFS_EXTENT_ITEM_KEY; ins.offset = num_bytes; path = btrfs_alloc_path(); if (!path) { test_msg("Couldn't allocate path\n"); return -ENOMEM; } path->leave_spinning = 1; ret = btrfs_insert_empty_item(&trans, root, path, &ins, size); if (ret) { test_msg("Couldn't insert ref %d\n", ret); btrfs_free_path(path); return ret; } leaf = path->nodes[0]; item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); btrfs_set_extent_refs(leaf, item, 1); btrfs_set_extent_generation(leaf, item, 1); btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_TREE_BLOCK); block_info = (struct btrfs_tree_block_info *)(item + 1); btrfs_set_tree_block_level(leaf, block_info, 1); iref = (struct btrfs_extent_inline_ref *)(block_info + 1); if (parent > 0) { btrfs_set_extent_inline_ref_type(leaf, iref, BTRFS_SHARED_BLOCK_REF_KEY); btrfs_set_extent_inline_ref_offset(leaf, iref, parent); } else { btrfs_set_extent_inline_ref_type(leaf, iref, BTRFS_TREE_BLOCK_REF_KEY); btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid); } btrfs_free_path(path); return 0; }
/* * finds a free extent and does all the dirty work required for allocation * returns the key for the extent through ins, and a tree buffer for * the first block of the extent through buf. * * returns 0 if everything worked, non-zero otherwise. */ static int alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, u64 owner, u64 num_blocks, u64 search_start, u64 search_end, struct btrfs_key *ins) { int ret; int pending_ret; u64 super_blocks_used; struct btrfs_fs_info *info = root->fs_info; struct btrfs_root *extent_root = info->extent_root; struct btrfs_extent_item extent_item; btrfs_set_extent_refs(&extent_item, 1); btrfs_set_extent_owner(&extent_item, owner); if (root == extent_root) { BUG_ON(extent_root->fs_info->current_insert.offset == 0); BUG_ON(num_blocks != 1); BUG_ON(extent_root->fs_info->current_insert.flags == extent_root->fs_info->current_insert.offset); ins->offset = 1; ins->objectid = extent_root->fs_info->current_insert.objectid + extent_root->fs_info->current_insert.flags++; return 0; } ret = find_free_extent(trans, root, num_blocks, search_start, search_end, ins); if (ret) return ret; super_blocks_used = btrfs_super_blocks_used(info->disk_super); btrfs_set_super_blocks_used(info->disk_super, super_blocks_used + num_blocks); ret = btrfs_insert_item(trans, extent_root, ins, &extent_item, sizeof(extent_item)); finish_current_insert(trans, extent_root); pending_ret = run_pending(trans, extent_root); if (ret) return ret; if (pending_ret) return pending_ret; return 0; }
int make_btrfs(int fd, const char *device, const char *label, u64 blocks[7], u64 num_bytes, u32 nodesize, u32 leafsize, u32 sectorsize, u32 stripesize, u64 features) { struct btrfs_super_block super; struct extent_buffer *buf; struct btrfs_root_item root_item; struct btrfs_disk_key disk_key; struct btrfs_extent_item *extent_item; struct btrfs_inode_item *inode_item; struct btrfs_chunk *chunk; struct btrfs_dev_item *dev_item; struct btrfs_dev_extent *dev_extent; u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; u8 *ptr; int i; int ret; u32 itemoff; u32 nritems = 0; u64 first_free; u64 ref_root; u32 array_size; u32 item_size; int skinny_metadata = !!(features & BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA); first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1; first_free &= ~((u64)sectorsize - 1); memset(&super, 0, sizeof(super)); num_bytes = (num_bytes / sectorsize) * sectorsize; uuid_generate(super.fsid); uuid_generate(super.dev_item.uuid); uuid_generate(chunk_tree_uuid); btrfs_set_super_bytenr(&super, blocks[0]); btrfs_set_super_num_devices(&super, 1); btrfs_set_super_magic(&super, BTRFS_MAGIC); btrfs_set_super_generation(&super, 1); btrfs_set_super_root(&super, blocks[1]); btrfs_set_super_chunk_root(&super, blocks[3]); btrfs_set_super_total_bytes(&super, num_bytes); btrfs_set_super_bytes_used(&super, 6 * leafsize); btrfs_set_super_sectorsize(&super, sectorsize); btrfs_set_super_leafsize(&super, leafsize); btrfs_set_super_nodesize(&super, nodesize); btrfs_set_super_stripesize(&super, stripesize); btrfs_set_super_csum_type(&super, BTRFS_CSUM_TYPE_CRC32); btrfs_set_super_chunk_root_generation(&super, 1); btrfs_set_super_cache_generation(&super, -1); btrfs_set_super_incompat_flags(&super, features); if (label) strncpy(super.label, label, BTRFS_LABEL_SIZE - 1); buf = malloc(sizeof(*buf) + max(sectorsize, leafsize)); /* create the tree of root objects */ memset(buf->data, 0, leafsize); buf->len = leafsize; btrfs_set_header_bytenr(buf, blocks[1]); btrfs_set_header_nritems(buf, 4); btrfs_set_header_generation(buf, 1); btrfs_set_header_backref_rev(buf, BTRFS_MIXED_BACKREF_REV); btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID); write_extent_buffer(buf, super.fsid, btrfs_header_fsid(), BTRFS_FSID_SIZE); write_extent_buffer(buf, chunk_tree_uuid, (unsigned long) btrfs_header_chunk_tree_uuid(buf), BTRFS_UUID_SIZE); /* create the items for the root tree */ memset(&root_item, 0, sizeof(root_item)); inode_item = &root_item.inode; btrfs_set_stack_inode_generation(inode_item, 1); btrfs_set_stack_inode_size(inode_item, 3); btrfs_set_stack_inode_nlink(inode_item, 1); btrfs_set_stack_inode_nbytes(inode_item, leafsize); btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); btrfs_set_root_refs(&root_item, 1); btrfs_set_root_used(&root_item, leafsize); btrfs_set_root_generation(&root_item, 1); memset(&disk_key, 0, sizeof(disk_key)); btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY); btrfs_set_disk_key_offset(&disk_key, 0); nritems = 0; itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - sizeof(root_item); btrfs_set_root_bytenr(&root_item, blocks[2]); btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID); btrfs_set_item_key(buf, &disk_key, nritems); btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff); btrfs_set_item_size(buf, btrfs_item_nr(nritems), sizeof(root_item)); write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf, nritems), sizeof(root_item)); nritems++; itemoff = itemoff - sizeof(root_item); btrfs_set_root_bytenr(&root_item, blocks[4]); btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_TREE_OBJECTID); btrfs_set_item_key(buf, &disk_key, nritems); btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff); btrfs_set_item_size(buf, btrfs_item_nr(nritems), sizeof(root_item)); write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf, nritems), sizeof(root_item)); nritems++; itemoff = itemoff - sizeof(root_item); btrfs_set_root_bytenr(&root_item, blocks[5]); btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID); btrfs_set_item_key(buf, &disk_key, nritems); btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff); btrfs_set_item_size(buf, btrfs_item_nr(nritems), sizeof(root_item)); write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf, nritems), sizeof(root_item)); nritems++; itemoff = itemoff - sizeof(root_item); btrfs_set_root_bytenr(&root_item, blocks[6]); btrfs_set_disk_key_objectid(&disk_key, BTRFS_CSUM_TREE_OBJECTID); btrfs_set_item_key(buf, &disk_key, nritems); btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff); btrfs_set_item_size(buf, btrfs_item_nr(nritems), sizeof(root_item)); write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf, nritems), sizeof(root_item)); nritems++; csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0); ret = pwrite(fd, buf->data, leafsize, blocks[1]); if (ret != leafsize) { ret = (ret < 0 ? -errno : -EIO); goto out; } /* create the items for the extent tree */ memset(buf->data+sizeof(struct btrfs_header), 0, leafsize-sizeof(struct btrfs_header)); nritems = 0; itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize); for (i = 1; i < 7; i++) { item_size = sizeof(struct btrfs_extent_item); if (!skinny_metadata) item_size += sizeof(struct btrfs_tree_block_info); BUG_ON(blocks[i] < first_free); BUG_ON(blocks[i] < blocks[i - 1]); /* create extent item */ itemoff -= item_size; btrfs_set_disk_key_objectid(&disk_key, blocks[i]); if (skinny_metadata) { btrfs_set_disk_key_type(&disk_key, BTRFS_METADATA_ITEM_KEY); btrfs_set_disk_key_offset(&disk_key, 0); } else { btrfs_set_disk_key_type(&disk_key, BTRFS_EXTENT_ITEM_KEY); btrfs_set_disk_key_offset(&disk_key, leafsize); } btrfs_set_item_key(buf, &disk_key, nritems); btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff); btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size); extent_item = btrfs_item_ptr(buf, nritems, struct btrfs_extent_item); btrfs_set_extent_refs(buf, extent_item, 1); btrfs_set_extent_generation(buf, extent_item, 1); btrfs_set_extent_flags(buf, extent_item, BTRFS_EXTENT_FLAG_TREE_BLOCK); nritems++; /* create extent ref */ ref_root = reference_root_table[i]; btrfs_set_disk_key_objectid(&disk_key, blocks[i]); btrfs_set_disk_key_offset(&disk_key, ref_root); btrfs_set_disk_key_type(&disk_key, BTRFS_TREE_BLOCK_REF_KEY); btrfs_set_item_key(buf, &disk_key, nritems); btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff); btrfs_set_item_size(buf, btrfs_item_nr(nritems), 0); nritems++; } btrfs_set_header_bytenr(buf, blocks[2]); btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID); btrfs_set_header_nritems(buf, nritems); csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0); ret = pwrite(fd, buf->data, leafsize, blocks[2]); if (ret != leafsize) { ret = (ret < 0 ? -errno : -EIO); goto out; } /* create the chunk tree */ memset(buf->data+sizeof(struct btrfs_header), 0, leafsize-sizeof(struct btrfs_header)); nritems = 0; item_size = sizeof(*dev_item); itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - item_size; /* first device 1 (there is no device 0) */ btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID); btrfs_set_disk_key_offset(&disk_key, 1); btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY); btrfs_set_item_key(buf, &disk_key, nritems); btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff); btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size); dev_item = btrfs_item_ptr(buf, nritems, struct btrfs_dev_item); btrfs_set_device_id(buf, dev_item, 1); btrfs_set_device_generation(buf, dev_item, 0); btrfs_set_device_total_bytes(buf, dev_item, num_bytes); btrfs_set_device_bytes_used(buf, dev_item, BTRFS_MKFS_SYSTEM_GROUP_SIZE); btrfs_set_device_io_align(buf, dev_item, sectorsize); btrfs_set_device_io_width(buf, dev_item, sectorsize); btrfs_set_device_sector_size(buf, dev_item, sectorsize); btrfs_set_device_type(buf, dev_item, 0); write_extent_buffer(buf, super.dev_item.uuid, (unsigned long)btrfs_device_uuid(dev_item), BTRFS_UUID_SIZE); write_extent_buffer(buf, super.fsid, (unsigned long)btrfs_device_fsid(dev_item), BTRFS_UUID_SIZE); read_extent_buffer(buf, &super.dev_item, (unsigned long)dev_item, sizeof(*dev_item)); nritems++; item_size = btrfs_chunk_item_size(1); itemoff = itemoff - item_size; /* then we have chunk 0 */ btrfs_set_disk_key_objectid(&disk_key, BTRFS_FIRST_CHUNK_TREE_OBJECTID); btrfs_set_disk_key_offset(&disk_key, 0); btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_ITEM_KEY); btrfs_set_item_key(buf, &disk_key, nritems); btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff); btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size); chunk = btrfs_item_ptr(buf, nritems, struct btrfs_chunk); btrfs_set_chunk_length(buf, chunk, BTRFS_MKFS_SYSTEM_GROUP_SIZE); btrfs_set_chunk_owner(buf, chunk, BTRFS_EXTENT_TREE_OBJECTID); btrfs_set_chunk_stripe_len(buf, chunk, 64 * 1024); btrfs_set_chunk_type(buf, chunk, BTRFS_BLOCK_GROUP_SYSTEM); btrfs_set_chunk_io_align(buf, chunk, sectorsize); btrfs_set_chunk_io_width(buf, chunk, sectorsize); btrfs_set_chunk_sector_size(buf, chunk, sectorsize); btrfs_set_chunk_num_stripes(buf, chunk, 1); btrfs_set_stripe_devid_nr(buf, chunk, 0, 1); btrfs_set_stripe_offset_nr(buf, chunk, 0, 0); nritems++; write_extent_buffer(buf, super.dev_item.uuid, (unsigned long)btrfs_stripe_dev_uuid(&chunk->stripe), BTRFS_UUID_SIZE); /* copy the key for the chunk to the system array */ ptr = super.sys_chunk_array; array_size = sizeof(disk_key); memcpy(ptr, &disk_key, sizeof(disk_key)); ptr += sizeof(disk_key); /* copy the chunk to the system array */ read_extent_buffer(buf, ptr, (unsigned long)chunk, item_size); array_size += item_size; ptr += item_size; btrfs_set_super_sys_array_size(&super, array_size); btrfs_set_header_bytenr(buf, blocks[3]); btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID); btrfs_set_header_nritems(buf, nritems); csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0); ret = pwrite(fd, buf->data, leafsize, blocks[3]); if (ret != leafsize) { ret = (ret < 0 ? -errno : -EIO); goto out; } /* create the device tree */ memset(buf->data+sizeof(struct btrfs_header), 0, leafsize-sizeof(struct btrfs_header)); nritems = 0; itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - sizeof(struct btrfs_dev_extent); btrfs_set_disk_key_objectid(&disk_key, 1); btrfs_set_disk_key_offset(&disk_key, 0); btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY); btrfs_set_item_key(buf, &disk_key, nritems); btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff); btrfs_set_item_size(buf, btrfs_item_nr(nritems), sizeof(struct btrfs_dev_extent)); dev_extent = btrfs_item_ptr(buf, nritems, struct btrfs_dev_extent); btrfs_set_dev_extent_chunk_tree(buf, dev_extent, BTRFS_CHUNK_TREE_OBJECTID); btrfs_set_dev_extent_chunk_objectid(buf, dev_extent, BTRFS_FIRST_CHUNK_TREE_OBJECTID); btrfs_set_dev_extent_chunk_offset(buf, dev_extent, 0); write_extent_buffer(buf, chunk_tree_uuid, (unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent), BTRFS_UUID_SIZE); btrfs_set_dev_extent_length(buf, dev_extent, BTRFS_MKFS_SYSTEM_GROUP_SIZE); nritems++; btrfs_set_header_bytenr(buf, blocks[4]); btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID); btrfs_set_header_nritems(buf, nritems); csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0); ret = pwrite(fd, buf->data, leafsize, blocks[4]); if (ret != leafsize) { ret = (ret < 0 ? -errno : -EIO); goto out; } /* create the FS root */ memset(buf->data+sizeof(struct btrfs_header), 0, leafsize-sizeof(struct btrfs_header)); btrfs_set_header_bytenr(buf, blocks[5]); btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID); btrfs_set_header_nritems(buf, 0); csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0); ret = pwrite(fd, buf->data, leafsize, blocks[5]); if (ret != leafsize) { ret = (ret < 0 ? -errno : -EIO); goto out; } /* finally create the csum root */ memset(buf->data+sizeof(struct btrfs_header), 0, leafsize-sizeof(struct btrfs_header)); btrfs_set_header_bytenr(buf, blocks[6]); btrfs_set_header_owner(buf, BTRFS_CSUM_TREE_OBJECTID); btrfs_set_header_nritems(buf, 0); csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0); ret = pwrite(fd, buf->data, leafsize, blocks[6]); if (ret != leafsize) { ret = (ret < 0 ? -errno : -EIO); goto out; } /* and write out the super block */ BUG_ON(sizeof(super) > sectorsize); memset(buf->data, 0, sectorsize); memcpy(buf->data, &super, sizeof(super)); buf->len = sectorsize; csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0); ret = pwrite(fd, buf->data, sectorsize, blocks[0]); if (ret != sectorsize) { ret = (ret < 0 ? -errno : -EIO); goto out; } ret = 0; out: free(buf); return ret; }
static int record_file_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root, u64 objectid, struct btrfs_inode_item *inode, u64 file_pos, u64 disk_bytenr, u64 num_bytes) { int ret; struct btrfs_fs_info *info = root->fs_info; struct btrfs_root *extent_root = info->extent_root; struct extent_buffer *leaf; struct btrfs_file_extent_item *fi; struct btrfs_key ins_key; struct btrfs_path path; struct btrfs_extent_item *ei; btrfs_init_path(&path); ins_key.objectid = objectid; ins_key.offset = 0; btrfs_set_key_type(&ins_key, BTRFS_EXTENT_DATA_KEY); ret = btrfs_insert_empty_item(trans, root, &path, &ins_key, sizeof(*fi)); if (ret) goto fail; leaf = path.nodes[0]; fi = btrfs_item_ptr(leaf, path.slots[0], struct btrfs_file_extent_item); btrfs_set_file_extent_generation(leaf, fi, trans->transid); btrfs_set_file_extent_type(leaf, fi, BTRFS_FILE_EXTENT_REG); btrfs_set_file_extent_disk_bytenr(leaf, fi, disk_bytenr); btrfs_set_file_extent_disk_num_bytes(leaf, fi, num_bytes); btrfs_set_file_extent_offset(leaf, fi, 0); btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes); btrfs_set_file_extent_ram_bytes(leaf, fi, num_bytes); btrfs_set_file_extent_compression(leaf, fi, 0); btrfs_set_file_extent_encryption(leaf, fi, 0); btrfs_set_file_extent_other_encoding(leaf, fi, 0); btrfs_mark_buffer_dirty(leaf); btrfs_release_path(root, &path); ins_key.objectid = disk_bytenr; ins_key.offset = num_bytes; ins_key.type = BTRFS_EXTENT_ITEM_KEY; ret = btrfs_insert_empty_item(trans, extent_root, &path, &ins_key, sizeof(*ei)); if (ret == 0) { leaf = path.nodes[0]; ei = btrfs_item_ptr(leaf, path.slots[0], struct btrfs_extent_item); btrfs_set_extent_refs(leaf, ei, 0); btrfs_set_extent_generation(leaf, ei, trans->transid); btrfs_set_extent_flags(leaf, ei, BTRFS_EXTENT_FLAG_DATA); btrfs_mark_buffer_dirty(leaf); ret = btrfs_update_block_group(trans, root, disk_bytenr, num_bytes, 1, 0); if (ret) goto fail; } else if (ret != -EEXIST) {